diff options
Diffstat (limited to 'src/backend/executor/nodeSubqueryscan.c')
| -rw-r--r-- | src/backend/executor/nodeSubqueryscan.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/src/backend/executor/nodeSubqueryscan.c b/src/backend/executor/nodeSubqueryscan.c index 3f66e243d2a..e5d1e540c46 100644 --- a/src/backend/executor/nodeSubqueryscan.c +++ b/src/backend/executor/nodeSubqueryscan.c @@ -56,7 +56,15 @@ SubqueryNext(SubqueryScanState *node) * We just return the subplan's result slot, rather than expending extra * cycles for ExecCopySlot(). (Our own ScanTupleSlot is used only for * EvalPlanQual rechecks.) + * + * We do need to mark the slot contents read-only to prevent interference + * between different functions reading the same datum from the slot. It's + * a bit hokey to do this to the subplan's slot, but should be safe + * enough. */ + if (!TupIsNull(slot)) + slot = ExecMakeSlotContentsReadOnly(slot); + return slot; } |